Stage 1 was to study the level of immunity in the community, based on research from 1997-1999, the level of immunity was revealed to have fallen to 78.4 per cent, a warning signifying an epidemic to happen; Stage 2 was to determine the ratio of eye disabilities as an outcome of being affected by congenital measles among the children aged 0-4 years who had referred to the health centres in Tehran in 1999; the population covered by this programme was 1,000 children from 0-4 years of age; Stage 3 was to determine the ratio of eye disabilities among the population under coverage of stage 2, in 2000.
- La fase 2 consistió en determinar la incidencia de trastornos visuales resultantes del sarampión congénito en los niños de 0 a 4 años que habían visitado los centros de salud de Teherán en 1999; este programa abarcó a una población de 1.000 niños de estas edades;